Half to richard grant



(No Model.) I 2 SheetS-Shehet 1.

J. MONTGOMERY.

GRATE BAR.

2 Sheets- Sheetl 2 GR'ATE BAB. v

N0.478,o1s. Patent-@Muna 28,1892.

UNITED STATES JAMES MONTGOMERY, OF JERSEY CITY, NEW JERSEY, ASSIGNOR OF ONE- PATENT OFFICE.

HALF TO RICHARD GRANT, OF SAME PLACE.

G RAT E-BAR.

SPECIFICATION forming part of Letters Patent No. 478,013, dated June 28, 1892.

Application filed January 23, 1892. Serial No. 418,993. (No model.) i

To all whom tpm/ay concern:

Be it known that I, JAMES MONTGOMERY, a citizen of the United States, residing at Jersey City, county of Hudson, State of New Jer- Soy, have invented certain new and useful Improvements in Casting Grate-Bars, of which the following is a specification, reference belng had to the accompanying drawings, forming part hereof.

This invention relates to casting grate-bars for furnaces, and has for its object to simplify and improve the means for making such castings.

It consists of certain improvements in the patterns, cores, and core-boxes and in the means for holding such cores in place in the iiask.

W'hen my entire invention is used, the pattern is adjustable for diiferent lengths of grate-bars, so that one pattern can be used for producing grate-bars of various lengths.

The particular form of grate-bar to which my invention is especially adapted is that which consists of an apertured top plate and longitudinal supporting ribs or bars extending nearly from end to end of the top plate and joined to the top plate along their upper edges. Such grate-bars have heretofore been cast in three-part iiasks of special construction.

My invention permits such grate-bars to be cast in a two-part flask, thus greatly reducing the cost as well as the time required in forming the mold and casting the bar.

My invention also greatly facilitates the shaping of the mold by removable sliding pieces which form the molds for the longitudinal bars and insures greater certainty of forming perfect molds, the ends of thegrate-bar being shaped by cores of simple construction.

My invention also provides an efficient means for forming apertures in the longitudinal bars and bands.

In the accompanying drawings, Figure l is a side elevation of my improved adjustable` pattern. Fig. 2 is a plan View of the same. Fig. 8 is a vertical section on the line 3 3, Figs. l and 2. Eig. 4. shows a plan and side elevation of one of the removable pieces for closing the apertures in the top plate of the pattern. Fig.-5 is alongitudinal vertical section on the line 5 5, Fig. 6, of a flask and sandmold, the mold having been formed by my improved pattern shown in Figs. 1, 2, 3, and 4, and the cores for forming apertures in the longitudinal bands and bars being held in place according to my invention. Fig. 6 is a transverse vertical section of the same on the line 6 6, Fig. 5. Figs. 7 and 8 are two enlarged detached perspectives completely showing my improved core-box for shaping the cores for the ends of the grate-bar; and Fig. 9 is a perspective view of such core ready for insertion 'in the mold, drawn to the same scale as Figs.

7 and 8.

The pattern shown in Figs. l, 2, 3, and 4t consists of a top plate a, two-core-print-forming projections b and b at each end thereof, and removable sliding longitudinal pieces c c', two for each longitudinal bar, such pieces cc being fitted to slide through the core-print forming projections b and h and against the under surface of the top plate a, and the opposite pieces c and c' of each bar meeting and abutting against each other at a point between the core-print-forming projections b and b. These sliding pieces preferably taper very slightly but inappreciably toward their inner ends, so that they may be readily withdrawn from the sand mold after the same is shaped' thereby. The usual V shape of the upper edge of the longitudinal bar provides a guide for the longitudinal pieces throughout their length, as shown.

When my entire invention is used, one of the core-print-forming projections, as b', is adjustable and-is fitted to slide along the top plate a, being held in desired position by the set-screws b2. By the adjustment of the coreprint-forming projection b the one pattern can be used in producing bars of various lengths, limited only by the extreme length of the pattern, thus greatly reducing the cost of manufacturing the grate-bars. Heretofore in manufacturing grate-bars of this class it has been necessary to keep on hand and use a large number of patterns diering from each other but slightly in length to accommodate the demand for many different lengths of grate-bars, and this has necessitated aheavy original expense, as well as the cost of repairing and renewing these many patterns.

At those portions of the topplate a that IOO are directly over the core-forming projections there should be no apertures, as the formation of the apertures at these places inV the casting will be effected by the cores. I therefore provide removablepieces cl, (see Fig. 4,) adapted to tit within and close the apertures of the top plate, and these pieces are inserted in such apertures above the adjustable coreprint-forming projection b whatever may be its position, as shown in Fig. 2.

The mold is shaped for the side lugs that are usually present in bars of this class by means of the removable wedge-shaped pieces a', which slide in tapering dovetailed slots in the sides of the top plate a. These pieces a may be removed, as shown, to permit the adjustable projection b to occupy any desired position.

The core-box for forming the core which acts as the mold for the end of the left-hand bar is shown in Figs. 'Zand 8. It is composed of several pieces removably fitted together, so that after the sand for the core has been tightly packed therein the portions of the boX may be removed without breaking the core. These pieces comprise the top piece e, pro vided with apertures corresponding to the apertures that will appear in the cast bar, the side pieces ff and end pieces ff, (the front side piecef and the right-hand end piece f being secured together and the rear side piece fand left-hand end piece f being fastened togethen) and the longitudinal ribs g g, which correspond in shape to the ends of the longitudinal supporting ribs or bars of the gratebar. The core h as shaped by this core-box is shown in Fig. t). The core-box for the righthand end of the grate-bar is not shown, as it would closely correspond to the core-box shown. The core h for the left-hand end of the bar and the core 7L for the right-hand end of the grate-bar are both shown in place in the mold in Fig. 5.

The flask for the sand mold is an ordinary two-part flask t' 75'; but the lower flask is provided with suitable openings at its ends to accommodate the projecting right-hand end of the pattern when the pattern is being used to forma mold shorter than the extremelength of the pattern and to accommodate the ends of and permit thc removal of the longitudinal sliding pieces c c. It is also provided with suitable openings at its sides for the insertion and removal of the cores for forming the openings in the longitudinal bars and bands of the grate-bar. Metallic envelopes or guides consisting of the tubes j and j for cores that will form openings inv the longitudinal bars and bands of the grate-bar are inserted in proper place in the sand mold, with the ends of the tubes projecting through the sand to the face of the mold and their interior opening registering with the openings in the sides of the iiask t'. The cores 7c and lo may be readily inserted or removed through these tubes without fear of breaking the mold. The only in through the tubes j and j.

' ings for receiving the molten metal.

effect of the small metallic rings in the face of the mold around such cores is to chill the cast metal around 'the openingsformed by such cores in the castin This materially strengthens the barsat these' places, and is therefore desirable. By means of these metallic envelopes or tubes l am enabled to form any desired number ot' openings 'through the longitudinal bands or bars of the grate-bar, and am thus enabled to economically produce the improved bar set forth and claimed in my application filled simultaneously herewith under Serial No. 418,994.

The sand mold is formed in the usual manner about myimproved pattern and the tubes above described. The longitudinal pieces c c are then pulled outward longitudinally,

and the pattern is then removed from the flask. The cores h and h for forming the ends of the bars are then placed inthe prints that have been formed therefor by the pattern.

The cylindrical cores 7c and 7c are also pushed The mold is now completely formed. It will be noted that both ends of the mold have openings that were formed by the ends of the longitudinal pieces c c. If the metal is to be poured from both ends of the fiasks, these openings will be used for that purpose, but if from only one end the small openings of the other end are stopped up with sand, as shown in Fig. 5, whereV the openings at the right-hand end of flask are stopped up. It will be evident that the sand mold thus formed is composed of cores at both ends and has suitable open- Where the ends of the grate-bar are the ordinary rammed-sand mold, they are apt to break down under the first impulse of the flow of the metal poured into the mold. This can never occur in a mold made according to my invention.

p What I claim, and desire to secure by Letters Patent, is-

1. A pattern for shaping molds for gratebars, consisting of a top plate having coreprint-forming projections at each end thereof and of removable sliding longitudinal pieces fitted to slide through such core-printforming projections and against the under surface of such top plate and meeting and abutting against each other at a point between such core-print-forrning projections, substantially as set forth.

2. A pattern forshaping molds for gratebars, consisting of an apertured top plate having a core-print-forming projection fixed at one end thereof Vvand an adjustable coreprint-forming projection fitted to slide thereon, removable sliding longitudinal pieces fitted to slide through such core-print-forming projections and against the under surface of the top plate and meeting and abutting against each other at a point between such core-print-t'ormingprojections,andremovable pieces fitted in and closing the apertures of IOO IIO

Athe top plate above such adjustable core-printa', itted in slots in the sides of the top plate 1'5 forming projection, substantially as set forth.' a; substantially as shownand described.

3. The core-box for forming the end cores 5. The combination, with the two-part flask of a grate-bar, consisting of the apertured top z' i', the sand mold formed therein, and the 5 piece e, the side pieces-f f,v the end pieces.4 f openings in the sides of suchiiask, of the,

f and the longitudinal ribs g g,snbstantially tubes j and j', cach extending from the side zo as shownand described.4 of ltne askrto the side ofthe mold, andthe 4. The pattern for shaping moldsfor grate` cylindrical cores kand kgrespectively tting bars, consisting of the apertured top plate a, Within the tubes j and j', substantially as lo the txed core-print-forming projection b, the shown and described.

adjustable core-printwforming projection b, JAMES MONTGOMERY.

the longitudinal sliding pieces c c', the remov- Vitnesses: able pieces d d for closin g apertures in the top HENRY D. WILLIAMS, plate,` and the removable Wedge-*shaped pieces HERBERT H. GIBBS; 

